2 * Copyright (c) 2010 Broadcom Corporation
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 #include <linux/kernel.h>
17 #include <net/mac80211.h>
27 #include "wlc_types.h"
33 #include "phy/wlc_phy_hal.h"
34 #include "wlc_antsel.h"
35 #include "wl_export.h"
37 #include "wlc_channel.h"
39 #include "wlc_ampdu.h"
41 #define AMPDU_MAX_MPDU 32 /* max number of mpdus in an ampdu */
42 #define AMPDU_NUM_MPDU_LEGACY 16 /* max number of mpdus in an ampdu to a legacy */
43 #define AMPDU_TX_BA_MAX_WSIZE 64 /* max Tx ba window size (in pdu) */
44 #define AMPDU_TX_BA_DEF_WSIZE 64 /* default Tx ba window size (in pdu) */
45 #define AMPDU_RX_BA_DEF_WSIZE 64 /* max Rx ba window size (in pdu) */
46 #define AMPDU_RX_BA_MAX_WSIZE 64 /* default Rx ba window size (in pdu) */
47 #define AMPDU_MAX_DUR 5 /* max dur of tx ampdu (in msec) */
48 #define AMPDU_DEF_RETRY_LIMIT 5 /* default tx retry limit */
49 #define AMPDU_DEF_RR_RETRY_LIMIT 2 /* default tx retry limit at reg rate */
50 #define AMPDU_DEF_TXPKT_WEIGHT 2 /* default weight of ampdu in txfifo */
51 #define AMPDU_DEF_FFPLD_RSVD 2048 /* default ffpld reserved bytes */
52 #define AMPDU_INI_FREE 10 /* # of inis to be freed on detach */
53 #define AMPDU_SCB_MAX_RELEASE 20 /* max # of mpdus released at a time */
55 #define NUM_FFPLD_FIFO 4 /* number of fifo concerned by pre-loading */
56 #define FFPLD_TX_MAX_UNFL 200 /* default value of the average number of ampdu
59 #define FFPLD_MPDU_SIZE 1800 /* estimate of maximum mpdu size */
60 #define FFPLD_MAX_MCS 23 /* we don't deal with mcs 32 */
61 #define FFPLD_PLD_INCR 1000 /* increments in bytes */
62 #define FFPLD_MAX_AMPDU_CNT 5000 /* maximum number of ampdu we
63 * accumulate between resets.
66 #define TX_SEQ_TO_INDEX(seq) ((seq) % AMPDU_TX_BA_MAX_WSIZE)
68 /* max possible overhead per mpdu in the ampdu; 3 is for roundup if needed */
69 #define AMPDU_MAX_MPDU_OVERHEAD (FCS_LEN + DOT11_ICV_AES_LEN +\
70 AMPDU_DELIMITER_LEN + 3\
71 + DOT11_A4_HDR_LEN + DOT11_QOS_LEN + DOT11_IV_MAX_LEN)
73 /* structure to hold tx fifo information and pre-loading state
74 * counters specific to tx underflows of ampdus
75 * some counters might be redundant with the ones in wlc or ampdu structures.
76 * This allows to maintain a specific state independently of
77 * how often and/or when the wlc counters are updated.
79 typedef struct wlc_fifo_info {
80 u16 ampdu_pld_size; /* number of bytes to be pre-loaded */
81 u8 mcs2ampdu_table[FFPLD_MAX_MCS + 1]; /* per-mcs max # of mpdus in an ampdu */
82 u16 prev_txfunfl; /* num of underflows last read from the HW macstats counter */
83 u32 accum_txfunfl; /* num of underflows since we modified pld params */
84 u32 accum_txampdu; /* num of tx ampdu since we modified pld params */
85 u32 prev_txampdu; /* previous reading of tx ampdu */
86 u32 dmaxferrate; /* estimated dma avg xfer rate in kbits/sec */
89 /* AMPDU module specific state */
91 struct wlc_info *wlc; /* pointer to main wlc structure */
92 int scb_handle; /* scb cubby handle to retrieve data from scb */
93 u8 ini_enable[AMPDU_MAX_SCB_TID]; /* per-tid initiator enable/disable of ampdu */
94 u8 ba_tx_wsize; /* Tx ba window size (in pdu) */
95 u8 ba_rx_wsize; /* Rx ba window size (in pdu) */
96 u8 retry_limit; /* mpdu transmit retry limit */
97 u8 rr_retry_limit; /* mpdu transmit retry limit at regular rate */
98 u8 retry_limit_tid[AMPDU_MAX_SCB_TID]; /* per-tid mpdu transmit retry limit */
99 /* per-tid mpdu transmit retry limit at regular rate */
100 u8 rr_retry_limit_tid[AMPDU_MAX_SCB_TID];
101 u8 mpdu_density; /* min mpdu spacing (0-7) ==> 2^(x-1)/8 usec */
102 s8 max_pdu; /* max pdus allowed in ampdu */
103 u8 dur; /* max duration of an ampdu (in msec) */
104 u8 txpkt_weight; /* weight of ampdu in txfifo; reduces rate lag */
105 u8 rx_factor; /* maximum rx ampdu factor (0-3) ==> 2^(13+x) bytes */
106 u32 ffpld_rsvd; /* number of bytes to reserve for preload */
107 u32 max_txlen[MCS_TABLE_SIZE][2][2]; /* max size of ampdu per mcs, bw and sgi */
108 void *ini_free[AMPDU_INI_FREE]; /* array of ini's to be freed on detach */
109 bool mfbr; /* enable multiple fallback rate */
110 u32 tx_max_funl; /* underflows should be kept such that
111 * (tx_max_funfl*underflows) < tx frames
113 wlc_fifo_info_t fifo_tb[NUM_FFPLD_FIFO]; /* table of fifo infos */
117 /* used for flushing ampdu packets */
118 struct cb_del_ampdu_pars {
119 struct ieee80211_sta *sta;
123 #define AMPDU_CLEANUPFLAG_RX (0x1)
124 #define AMPDU_CLEANUPFLAG_TX (0x2)
126 #define SCB_AMPDU_CUBBY(ampdu, scb) (&(scb->scb_ampdu))
127 #define SCB_AMPDU_INI(scb_ampdu, tid) (&(scb_ampdu->ini[tid]))
129 static void wlc_ffpld_init(struct ampdu_info *ampdu);
130 static int wlc_ffpld_check_txfunfl(struct wlc_info *wlc, int f);
131 static void wlc_ffpld_calc_mcs2ampdu_table(struct ampdu_info *ampdu, int f);
133 static scb_ampdu_tid_ini_t *wlc_ampdu_init_tid_ini(struct ampdu_info *ampdu,
134 scb_ampdu_t *scb_ampdu,
135 u8 tid, bool override);
136 static void ampdu_update_max_txlen(struct ampdu_info *ampdu, u8 dur);
137 static void scb_ampdu_update_config(struct ampdu_info *ampdu, struct scb *scb);
138 static void scb_ampdu_update_config_all(struct ampdu_info *ampdu);
140 #define wlc_ampdu_txflowcontrol(a, b, c) do {} while (0)
142 static void wlc_ampdu_dotxstatus_complete(struct ampdu_info *ampdu,
144 struct sk_buff *p, tx_status_t *txs,
145 u32 frmtxstatus, u32 frmtxstatus2);
146 static bool wlc_ampdu_cap(struct ampdu_info *ampdu);
147 static int wlc_ampdu_set(struct ampdu_info *ampdu, bool on);
149 struct ampdu_info *wlc_ampdu_attach(struct wlc_info *wlc)
151 struct ampdu_info *ampdu;
154 ampdu = kzalloc(sizeof(struct ampdu_info), GFP_ATOMIC);
156 wiphy_err(wlc->wiphy, "wl%d: wlc_ampdu_attach: out of mem\n",
162 for (i = 0; i < AMPDU_MAX_SCB_TID; i++)
163 ampdu->ini_enable[i] = true;
164 /* Disable ampdu for VO by default */
165 ampdu->ini_enable[PRIO_8021D_VO] = false;
166 ampdu->ini_enable[PRIO_8021D_NC] = false;
168 /* Disable ampdu for BK by default since not enough fifo space */
169 ampdu->ini_enable[PRIO_8021D_NONE] = false;
170 ampdu->ini_enable[PRIO_8021D_BK] = false;
172 ampdu->ba_tx_wsize = AMPDU_TX_BA_DEF_WSIZE;
173 ampdu->ba_rx_wsize = AMPDU_RX_BA_DEF_WSIZE;
174 ampdu->mpdu_density = AMPDU_DEF_MPDU_DENSITY;
175 ampdu->max_pdu = AUTO;
176 ampdu->dur = AMPDU_MAX_DUR;
177 ampdu->txpkt_weight = AMPDU_DEF_TXPKT_WEIGHT;
179 ampdu->ffpld_rsvd = AMPDU_DEF_FFPLD_RSVD;
180 /* bump max ampdu rcv size to 64k for all 11n devices except 4321A0 and 4321A1 */
181 if (WLCISNPHY(wlc->band) && NREV_LT(wlc->band->phyrev, 2))
182 ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_32K;
184 ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_64K;
185 ampdu->retry_limit = AMPDU_DEF_RETRY_LIMIT;
186 ampdu->rr_retry_limit = AMPDU_DEF_RR_RETRY_LIMIT;
188 for (i = 0; i < AMPDU_MAX_SCB_TID; i++) {
189 ampdu->retry_limit_tid[i] = ampdu->retry_limit;
190 ampdu->rr_retry_limit_tid[i] = ampdu->rr_retry_limit;
193 ampdu_update_max_txlen(ampdu, ampdu->dur);
195 /* try to set ampdu to the default value */
196 wlc_ampdu_set(ampdu, wlc->pub->_ampdu);
198 ampdu->tx_max_funl = FFPLD_TX_MAX_UNFL;
199 wlc_ffpld_init(ampdu);
204 void wlc_ampdu_detach(struct ampdu_info *ampdu)
211 /* free all ini's which were to be freed on callbacks which were never called */
212 for (i = 0; i < AMPDU_INI_FREE; i++) {
213 kfree(ampdu->ini_free[i]);
216 wlc_module_unregister(ampdu->wlc->pub, "ampdu", ampdu);
220 static void scb_ampdu_update_config(struct ampdu_info *ampdu, struct scb *scb)
222 scb_ampdu_t *scb_ampdu = SCB_AMPDU_CUBBY(ampdu, scb);
225 scb_ampdu->max_pdu = (u8) ampdu->wlc->pub->tunables->ampdunummpdu;
227 /* go back to legacy size if some preloading is occurring */
228 for (i = 0; i < NUM_FFPLD_FIFO; i++) {
229 if (ampdu->fifo_tb[i].ampdu_pld_size > FFPLD_PLD_INCR)
230 scb_ampdu->max_pdu = AMPDU_NUM_MPDU_LEGACY;
233 /* apply user override */
234 if (ampdu->max_pdu != AUTO)
235 scb_ampdu->max_pdu = (u8) ampdu->max_pdu;
237 scb_ampdu->release = min_t(u8, scb_ampdu->max_pdu, AMPDU_SCB_MAX_RELEASE);
239 if (scb_ampdu->max_rxlen)
241 min_t(u8, scb_ampdu->release, scb_ampdu->max_rxlen / 1600);
243 scb_ampdu->release = min(scb_ampdu->release,
244 ampdu->fifo_tb[TX_AC_BE_FIFO].
245 mcs2ampdu_table[FFPLD_MAX_MCS]);
248 static void scb_ampdu_update_config_all(struct ampdu_info *ampdu)
250 scb_ampdu_update_config(ampdu, ampdu->wlc->pub->global_scb);
253 static void wlc_ffpld_init(struct ampdu_info *ampdu)
256 wlc_fifo_info_t *fifo;
258 for (j = 0; j < NUM_FFPLD_FIFO; j++) {
259 fifo = (ampdu->fifo_tb + j);
260 fifo->ampdu_pld_size = 0;
261 for (i = 0; i <= FFPLD_MAX_MCS; i++)
262 fifo->mcs2ampdu_table[i] = 255;
263 fifo->dmaxferrate = 0;
264 fifo->accum_txampdu = 0;
265 fifo->prev_txfunfl = 0;
266 fifo->accum_txfunfl = 0;
271 /* evaluate the dma transfer rate using the tx underflows as feedback.
272 * If necessary, increase tx fifo preloading. If not enough,
273 * decrease maximum ampdu size for each mcs till underflows stop
274 * Return 1 if pre-loading not active, -1 if not an underflow event,
275 * 0 if pre-loading module took care of the event.
277 static int wlc_ffpld_check_txfunfl(struct wlc_info *wlc, int fid)
279 struct ampdu_info *ampdu = wlc->ampdu;
280 u32 phy_rate = MCS_RATE(FFPLD_MAX_MCS, true, false);
283 u32 current_ampdu_cnt = 0;
286 wlc_fifo_info_t *fifo = (ampdu->fifo_tb + fid);
290 /* return if we got here for a different reason than underflows */
293 M_UCODE_MACSTAT + offsetof(macstat_t, txfunfl[fid]));
294 new_txunfl = (u16) (cur_txunfl - fifo->prev_txfunfl);
295 if (new_txunfl == 0) {
296 BCMMSG(wlc->wiphy, "TX status FRAG set but no tx underflows\n");
299 fifo->prev_txfunfl = cur_txunfl;
301 if (!ampdu->tx_max_funl)
304 /* check if fifo is big enough */
305 if (wlc_xmtfifo_sz_get(wlc, fid, &xmtfifo_sz)) {
309 if ((TXFIFO_SIZE_UNIT * (u32) xmtfifo_sz) <= ampdu->ffpld_rsvd)
312 max_pld_size = TXFIFO_SIZE_UNIT * xmtfifo_sz - ampdu->ffpld_rsvd;
313 fifo->accum_txfunfl += new_txunfl;
315 /* we need to wait for at least 10 underflows */
316 if (fifo->accum_txfunfl < 10)
319 BCMMSG(wlc->wiphy, "ampdu_count %d tx_underflows %d\n",
320 current_ampdu_cnt, fifo->accum_txfunfl);
323 compute the current ratio of tx unfl per ampdu.
324 When the current ampdu count becomes too
325 big while the ratio remains small, we reset
326 the current count in order to not
327 introduce too big of a latency in detecting a
328 large amount of tx underflows later.
331 txunfl_ratio = current_ampdu_cnt / fifo->accum_txfunfl;
333 if (txunfl_ratio > ampdu->tx_max_funl) {
334 if (current_ampdu_cnt >= FFPLD_MAX_AMPDU_CNT) {
335 fifo->accum_txfunfl = 0;
340 min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], AMPDU_NUM_MPDU_LEGACY);
342 /* In case max value max_pdu is already lower than
343 the fifo depth, there is nothing more we can do.
346 if (fifo->ampdu_pld_size >= max_mpdu * FFPLD_MPDU_SIZE) {
347 fifo->accum_txfunfl = 0;
351 if (fifo->ampdu_pld_size < max_pld_size) {
353 /* increment by TX_FIFO_PLD_INC bytes */
354 fifo->ampdu_pld_size += FFPLD_PLD_INCR;
355 if (fifo->ampdu_pld_size > max_pld_size)
356 fifo->ampdu_pld_size = max_pld_size;
358 /* update scb release size */
359 scb_ampdu_update_config_all(ampdu);
362 compute a new dma xfer rate for max_mpdu @ max mcs.
363 This is the minimum dma rate that
364 can achieve no underflow condition for the current mpdu size.
366 /* note : we divide/multiply by 100 to avoid integer overflows */
369 (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size))
370 / (max_mpdu * FFPLD_MPDU_SIZE)) * 100;
372 BCMMSG(wlc->wiphy, "DMA estimated transfer rate %d; "
373 "pre-load size %d\n",
374 fifo->dmaxferrate, fifo->ampdu_pld_size);
377 /* decrease ampdu size */
378 if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] > 1) {
379 if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] == 255)
380 fifo->mcs2ampdu_table[FFPLD_MAX_MCS] =
381 AMPDU_NUM_MPDU_LEGACY - 1;
383 fifo->mcs2ampdu_table[FFPLD_MAX_MCS] -= 1;
385 /* recompute the table */
386 wlc_ffpld_calc_mcs2ampdu_table(ampdu, fid);
388 /* update scb release size */
389 scb_ampdu_update_config_all(ampdu);
392 fifo->accum_txfunfl = 0;
396 static void wlc_ffpld_calc_mcs2ampdu_table(struct ampdu_info *ampdu, int f)
399 u32 phy_rate, dma_rate, tmp;
401 wlc_fifo_info_t *fifo = (ampdu->fifo_tb + f);
403 /* recompute the dma rate */
404 /* note : we divide/multiply by 100 to avoid integer overflows */
406 min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], AMPDU_NUM_MPDU_LEGACY);
407 phy_rate = MCS_RATE(FFPLD_MAX_MCS, true, false);
410 (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size))
411 / (max_mpdu * FFPLD_MPDU_SIZE)) * 100;
412 fifo->dmaxferrate = dma_rate;
414 /* fill up the mcs2ampdu table; do not recalc the last mcs */
415 dma_rate = dma_rate >> 7;
416 for (i = 0; i < FFPLD_MAX_MCS; i++) {
417 /* shifting to keep it within integer range */
418 phy_rate = MCS_RATE(i, true, false) >> 7;
419 if (phy_rate > dma_rate) {
420 tmp = ((fifo->ampdu_pld_size * phy_rate) /
421 ((phy_rate - dma_rate) * FFPLD_MPDU_SIZE)) + 1;
422 tmp = min_t(u32, tmp, 255);
423 fifo->mcs2ampdu_table[i] = (u8) tmp;
429 wlc_ampdu_agg(struct ampdu_info *ampdu, struct scb *scb, struct sk_buff *p,
432 scb_ampdu_t *scb_ampdu;
433 scb_ampdu_tid_ini_t *ini;
434 u8 tid = (u8) (p->priority);
436 scb_ampdu = SCB_AMPDU_CUBBY(ampdu, scb);
438 /* initialize initiator on first packet; sends addba req */
439 ini = SCB_AMPDU_INI(scb_ampdu, tid);
440 if (ini->magic != INI_MAGIC) {
441 ini = wlc_ampdu_init_tid_ini(ampdu, scb_ampdu, tid, false);
447 wlc_sendampdu(struct ampdu_info *ampdu, struct wlc_txq_info *qi,
448 struct sk_buff **pdu, int prec)
450 struct wlc_info *wlc;
451 struct sk_buff *p, *pkt[AMPDU_MAX_MPDU];
454 u8 preamble_type = WLC_GF_PREAMBLE;
455 u8 fbr_preamble_type = WLC_GF_PREAMBLE;
456 u8 rts_preamble_type = WLC_LONG_PREAMBLE;
457 u8 rts_fbr_preamble_type = WLC_LONG_PREAMBLE;
459 bool rr = true, fbr = false;
460 uint i, count = 0, fifo, seg_cnt = 0;
461 u16 plen, len, seq = 0, mcl, mch, index, frameid, dma_len = 0;
462 u32 ampdu_len, maxlen = 0;
463 d11txh_t *txh = NULL;
465 struct ieee80211_hdr *h;
467 scb_ampdu_t *scb_ampdu;
468 scb_ampdu_tid_ini_t *ini;
470 bool use_rts = false, use_cts = false;
471 ratespec_t rspec = 0, rspec_fallback = 0;
472 ratespec_t rts_rspec = 0, rts_rspec_fallback = 0;
473 u16 mimo_ctlchbw = PHY_TXC1_BW_20MHZ;
474 struct ieee80211_rts *rts;
478 struct ieee80211_tx_info *tx_info;
486 tid = (u8) (p->priority);
488 f = ampdu->fifo_tb + prio2fifo[tid];
490 scb = wlc->pub->global_scb;
491 scb_ampdu = SCB_AMPDU_CUBBY(ampdu, scb);
492 ini = &scb_ampdu->ini[tid];
494 /* Let pressure continue to build ... */
495 qlen = pktq_plen(&qi->q, prec);
496 if (ini->tx_in_transit > 0 && qlen < scb_ampdu->max_pdu) {
500 wlc_ampdu_agg(ampdu, scb, p, tid);
502 if (wlc->block_datafifo) {
503 wiphy_err(wiphy, "%s: Fifo blocked\n", __func__);
506 rr_retry_limit = ampdu->rr_retry_limit_tid[tid];
510 struct ieee80211_tx_rate *txrate;
512 tx_info = IEEE80211_SKB_CB(p);
513 txrate = tx_info->status.rates;
515 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
516 err = wlc_prep_pdu(wlc, p, &fifo);
518 wiphy_err(wiphy, "%s: AMPDU flag is off!\n", __func__);
526 wiphy_err(wiphy, "wl%d: wlc_sendampdu: "
527 "prep_xdu retry; seq 0x%x\n",
528 wlc->pub->unit, seq);
533 /* error in the packet; reject it */
534 wiphy_err(wiphy, "wl%d: wlc_sendampdu: prep_xdu "
535 "rejected; seq 0x%x\n", wlc->pub->unit, seq);
540 /* pkt is good to be aggregated */
541 txh = (d11txh_t *) p->data;
542 plcp = (u8 *) (txh + 1);
543 h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN);
544 seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT;
545 index = TX_SEQ_TO_INDEX(seq);
547 /* check mcl fields and test whether it can be agg'd */
548 mcl = le16_to_cpu(txh->MacTxControlLow);
549 mcl &= ~TXC_AMPDU_MASK;
550 fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x3);
551 txh->PreloadSize = 0; /* always default to 0 */
553 /* Handle retry limits */
554 if (txrate[0].count <= rr_retry_limit) {
564 /* extract the length info */
565 len = fbr_iscck ? WLC_GET_CCK_PLCP_LEN(txh->FragPLCPFallback)
566 : WLC_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback);
568 /* retrieve null delimiter count */
569 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM];
572 BCMMSG(wlc->wiphy, "wl%d: mpdu %d plcp_len %d\n",
573 wlc->pub->unit, count, len);
576 * aggregateable mpdu. For ucode/hw agg,
577 * test whether need to break or change the epoch
580 mcl |= (TXC_AMPDU_FIRST << TXC_AMPDU_SHIFT);
581 /* refill the bits since might be a retx mpdu */
582 mcl |= TXC_STARTMSDU;
583 rts = (struct ieee80211_rts *)&txh->rts_frame;
585 if (ieee80211_is_rts(rts->frame_control)) {
589 if (ieee80211_is_cts(rts->frame_control)) {
594 mcl |= (TXC_AMPDU_MIDDLE << TXC_AMPDU_SHIFT);
595 mcl &= ~(TXC_STARTMSDU | TXC_SENDRTS | TXC_SENDCTS);
598 len = roundup(len, 4);
599 ampdu_len += (len + (ndelim + 1) * AMPDU_DELIMITER_LEN);
601 dma_len += (u16) bcm_pkttotlen(p);
603 BCMMSG(wlc->wiphy, "wl%d: ampdu_len %d"
604 " seg_cnt %d null delim %d\n",
605 wlc->pub->unit, ampdu_len, seg_cnt, ndelim);
607 txh->MacTxControlLow = cpu_to_le16(mcl);
609 /* this packet is added */
612 /* patch the first MPDU */
614 u8 plcp0, plcp3, is40, sgi;
615 struct ieee80211_sta *sta;
617 sta = tx_info->control.sta;
623 plcp0 = txh->FragPLCPFallback[0];
624 plcp3 = txh->FragPLCPFallback[3];
627 is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0;
628 sgi = PLCP3_ISSGI(plcp3) ? 1 : 0;
629 mcs = plcp0 & ~MIMO_PLCP_40MHZ;
631 min(scb_ampdu->max_rxlen,
632 ampdu->max_txlen[mcs][is40][sgi]);
634 /* XXX Fix me to honor real max_rxlen */
635 /* can fix this as soon as ampdu_action() in mac80211.h
636 * gets extra u8buf_size par */
641 CHSPEC_SB_UPPER(WLC_BAND_PI_RADIO_CHANSPEC)
642 ? PHY_TXC1_BW_20MHZ_UP : PHY_TXC1_BW_20MHZ;
644 /* rebuild the rspec and rspec_fallback */
645 rspec = RSPEC_MIMORATE;
646 rspec |= plcp[0] & ~MIMO_PLCP_40MHZ;
647 if (plcp[0] & MIMO_PLCP_40MHZ)
648 rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT);
650 if (fbr_iscck) /* CCK */
652 CCK_RSPEC(CCK_PHY2MAC_RATE
653 (txh->FragPLCPFallback[0]));
655 rspec_fallback = RSPEC_MIMORATE;
657 txh->FragPLCPFallback[0] & ~MIMO_PLCP_40MHZ;
658 if (txh->FragPLCPFallback[0] & MIMO_PLCP_40MHZ)
660 (PHY_TXC1_BW_40MHZ <<
664 if (use_rts || use_cts) {
666 wlc_rspec_to_rts_rspec(wlc, rspec, false,
669 wlc_rspec_to_rts_rspec(wlc, rspec_fallback,
670 false, mimo_ctlchbw);
674 /* if (first mpdu for host agg) */
675 /* test whether to add more */
676 if ((MCS_RATE(mcs, true, false) >= f->dmaxferrate) &&
677 (count == f->mcs2ampdu_table[mcs])) {
678 BCMMSG(wlc->wiphy, "wl%d: PR 37644: stopping"
679 " ampdu at %d for mcs %d\n",
680 wlc->pub->unit, count, mcs);
684 if (count == scb_ampdu->max_pdu) {
688 /* check to see if the next pkt is a candidate for aggregation */
689 p = pktq_ppeek(&qi->q, prec);
690 tx_info = IEEE80211_SKB_CB(p); /* tx_info must be checked with current p */
693 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
694 ((u8) (p->priority) == tid)) {
697 bcm_pkttotlen(p) + AMPDU_MAX_MPDU_OVERHEAD;
698 plen = max(scb_ampdu->min_len, plen);
700 if ((plen + ampdu_len) > maxlen) {
702 wiphy_err(wiphy, "%s: Bogus plen #1\n",
707 /* check if there are enough descriptors available */
708 if (TXAVAIL(wlc, fifo) <= (seg_cnt + 1)) {
709 wiphy_err(wiphy, "%s: No fifo space "
714 p = bcm_pktq_pdeq(&qi->q, prec);
721 ini->tx_in_transit += count;
724 /* patch up the last txh */
725 txh = (d11txh_t *) pkt[count - 1]->data;
726 mcl = le16_to_cpu(txh->MacTxControlLow);
727 mcl &= ~TXC_AMPDU_MASK;
728 mcl |= (TXC_AMPDU_LAST << TXC_AMPDU_SHIFT);
729 txh->MacTxControlLow = cpu_to_le16(mcl);
731 /* remove the null delimiter after last mpdu */
732 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM];
733 txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM] = 0;
734 ampdu_len -= ndelim * AMPDU_DELIMITER_LEN;
736 /* remove the pad len from last mpdu */
737 fbr_iscck = ((le16_to_cpu(txh->XtraFrameTypes) & 0x3) == 0);
738 len = fbr_iscck ? WLC_GET_CCK_PLCP_LEN(txh->FragPLCPFallback)
739 : WLC_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback);
740 ampdu_len -= roundup(len, 4) - len;
742 /* patch up the first txh & plcp */
743 txh = (d11txh_t *) pkt[0]->data;
744 plcp = (u8 *) (txh + 1);
746 WLC_SET_MIMO_PLCP_LEN(plcp, ampdu_len);
747 /* mark plcp to indicate ampdu */
748 WLC_SET_MIMO_PLCP_AMPDU(plcp);
750 /* reset the mixed mode header durations */
753 wlc_calc_lsig_len(wlc, rspec, ampdu_len);
754 txh->MModeLen = cpu_to_le16(mmodelen);
755 preamble_type = WLC_MM_PREAMBLE;
757 if (txh->MModeFbrLen) {
759 wlc_calc_lsig_len(wlc, rspec_fallback, ampdu_len);
760 txh->MModeFbrLen = cpu_to_le16(mmfbrlen);
761 fbr_preamble_type = WLC_MM_PREAMBLE;
764 /* set the preload length */
765 if (MCS_RATE(mcs, true, false) >= f->dmaxferrate) {
766 dma_len = min(dma_len, f->ampdu_pld_size);
767 txh->PreloadSize = cpu_to_le16(dma_len);
769 txh->PreloadSize = 0;
771 mch = le16_to_cpu(txh->MacTxControlHigh);
773 /* update RTS dur fields */
774 if (use_rts || use_cts) {
776 rts = (struct ieee80211_rts *)&txh->rts_frame;
777 if ((mch & TXC_PREAMBLE_RTS_MAIN_SHORT) ==
778 TXC_PREAMBLE_RTS_MAIN_SHORT)
779 rts_preamble_type = WLC_SHORT_PREAMBLE;
781 if ((mch & TXC_PREAMBLE_RTS_FB_SHORT) ==
782 TXC_PREAMBLE_RTS_FB_SHORT)
783 rts_fbr_preamble_type = WLC_SHORT_PREAMBLE;
786 wlc_compute_rtscts_dur(wlc, use_cts, rts_rspec,
787 rspec, rts_preamble_type,
788 preamble_type, ampdu_len,
790 rts->duration = cpu_to_le16(durid);
791 durid = wlc_compute_rtscts_dur(wlc, use_cts,
794 rts_fbr_preamble_type,
797 txh->RTSDurFallback = cpu_to_le16(durid);
798 /* set TxFesTimeNormal */
799 txh->TxFesTimeNormal = rts->duration;
800 /* set fallback rate version of TxFesTimeNormal */
801 txh->TxFesTimeFallback = txh->RTSDurFallback;
804 /* set flag and plcp for fallback rate */
806 mch |= TXC_AMPDU_FBR;
807 txh->MacTxControlHigh = cpu_to_le16(mch);
808 WLC_SET_MIMO_PLCP_AMPDU(plcp);
809 WLC_SET_MIMO_PLCP_AMPDU(txh->FragPLCPFallback);
812 BCMMSG(wlc->wiphy, "wl%d: count %d ampdu_len %d\n",
813 wlc->pub->unit, count, ampdu_len);
815 /* inform rate_sel if it this is a rate probe pkt */
816 frameid = le16_to_cpu(txh->TxFrameID);
817 if (frameid & TXFID_RATE_PROBE_MASK) {
818 wiphy_err(wiphy, "%s: XXX what to do with "
819 "TXFID_RATE_PROBE_MASK!?\n", __func__);
821 for (i = 0; i < count; i++)
822 wlc_txfifo(wlc, fifo, pkt[i], i == (count - 1),
823 ampdu->txpkt_weight);
831 wlc_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb,
832 struct sk_buff *p, tx_status_t *txs)
834 scb_ampdu_t *scb_ampdu;
835 struct wlc_info *wlc = ampdu->wlc;
836 scb_ampdu_tid_ini_t *ini;
838 struct ieee80211_tx_info *tx_info;
840 tx_info = IEEE80211_SKB_CB(p);
842 /* BMAC_NOTE: For the split driver, second level txstatus comes later
843 * So if the ACK was received then wait for the second level else just
846 if (txs->status & TX_STATUS_ACK_RCV) {
849 /* wait till the next 8 bytes of txstatus is available */
850 while (((s1 = R_REG(&wlc->regs->frmtxstatus)) & TXS_V) == 0) {
853 if (status_delay > 10) {
854 return; /* error condition */
858 s2 = R_REG(&wlc->regs->frmtxstatus2);
862 scb_ampdu = SCB_AMPDU_CUBBY(ampdu, scb);
863 ini = SCB_AMPDU_INI(scb_ampdu, p->priority);
864 wlc_ampdu_dotxstatus_complete(ampdu, scb, p, txs, s1, s2);
866 /* loop through all pkts and free */
867 u8 queue = txs->frameid & TXFID_QUEUE_MASK;
871 tx_info = IEEE80211_SKB_CB(p);
872 txh = (d11txh_t *) p->data;
873 mcl = le16_to_cpu(txh->MacTxControlLow);
874 bcm_pkt_buf_free_skb(p);
875 /* break out if last packet of ampdu */
876 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) ==
879 p = GETNEXTTXP(wlc, queue);
881 wlc_txfifo_complete(wlc, queue, ampdu->txpkt_weight);
883 wlc_ampdu_txflowcontrol(wlc, scb_ampdu, ini);
887 rate_status(struct wlc_info *wlc, struct ieee80211_tx_info *tx_info,
888 tx_status_t *txs, u8 mcs)
890 struct ieee80211_tx_rate *txrate = tx_info->status.rates;
893 /* clear the rest of the rates */
894 for (i = 2; i < IEEE80211_TX_MAX_RATES; i++) {
900 #define SHORTNAME "AMPDU status"
903 wlc_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb,
904 struct sk_buff *p, tx_status_t *txs,
907 scb_ampdu_t *scb_ampdu;
908 struct wlc_info *wlc = ampdu->wlc;
909 scb_ampdu_tid_ini_t *ini;
910 u8 bitmap[8], queue, tid;
913 struct ieee80211_hdr *h;
914 u16 seq, start_seq = 0, bindex, index, mcl;
916 bool ba_recd = false, ack_recd = false;
917 u8 suc_mpdu = 0, tot_mpdu = 0;
919 bool update_rate = true, retry = true, tx_error = false;
922 u8 retry_limit, rr_retry_limit;
923 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p);
924 struct wiphy *wiphy = wlc->wiphy;
927 u8 hole[AMPDU_MAX_MPDU];
928 memset(hole, 0, sizeof(hole));
931 scb_ampdu = SCB_AMPDU_CUBBY(ampdu, scb);
932 tid = (u8) (p->priority);
934 ini = SCB_AMPDU_INI(scb_ampdu, tid);
935 retry_limit = ampdu->retry_limit_tid[tid];
936 rr_retry_limit = ampdu->rr_retry_limit_tid[tid];
937 memset(bitmap, 0, sizeof(bitmap));
938 queue = txs->frameid & TXFID_QUEUE_MASK;
939 supr_status = txs->status & TX_STATUS_SUPR_MASK;
941 if (txs->status & TX_STATUS_ACK_RCV) {
942 if (TX_STATUS_SUPR_UF == supr_status) {
946 WARN_ON(!(txs->status & TX_STATUS_INTERMEDIATE));
947 start_seq = txs->sequence >> SEQNUM_SHIFT;
948 bitmap[0] = (txs->status & TX_STATUS_BA_BMAP03_MASK) >>
949 TX_STATUS_BA_BMAP03_SHIFT;
951 WARN_ON(s1 & TX_STATUS_INTERMEDIATE);
952 WARN_ON(!(s1 & TX_STATUS_AMPDU));
955 (s1 & TX_STATUS_BA_BMAP47_MASK) <<
956 TX_STATUS_BA_BMAP47_SHIFT;
957 bitmap[1] = (s1 >> 8) & 0xff;
958 bitmap[2] = (s1 >> 16) & 0xff;
959 bitmap[3] = (s1 >> 24) & 0xff;
961 bitmap[4] = s2 & 0xff;
962 bitmap[5] = (s2 >> 8) & 0xff;
963 bitmap[6] = (s2 >> 16) & 0xff;
964 bitmap[7] = (s2 >> 24) & 0xff;
970 if (supr_status == TX_STATUS_SUPR_BADCH) {
971 wiphy_err(wiphy, "%s: Pkt tx suppressed, "
972 "illegal channel possibly %d\n",
973 __func__, CHSPEC_CHANNEL(
974 wlc->default_bss->chanspec));
976 if (supr_status != TX_STATUS_SUPR_FRAG)
977 wiphy_err(wiphy, "%s: wlc_ampdu_dotx"
978 "status:supr_status 0x%x\n",
979 __func__, supr_status);
981 /* no need to retry for badch; will fail again */
982 if (supr_status == TX_STATUS_SUPR_BADCH ||
983 supr_status == TX_STATUS_SUPR_EXPTIME) {
985 } else if (supr_status == TX_STATUS_SUPR_EXPTIME) {
986 /* TX underflow : try tuning pre-loading or ampdu size */
987 } else if (supr_status == TX_STATUS_SUPR_FRAG) {
988 /* if there were underflows, but pre-loading is not active,
989 notify rate adaptation.
991 if (wlc_ffpld_check_txfunfl(wlc, prio2fifo[tid])
996 } else if (txs->phyerr) {
998 wiphy_err(wiphy, "wl%d: wlc_ampdu_dotxstatus: tx phy "
999 "error (0x%x)\n", wlc->pub->unit,
1002 if (WL_ERROR_ON()) {
1003 bcm_prpkt("txpkt (AMPDU)", p);
1004 wlc_print_txdesc((d11txh_t *) p->data);
1006 wlc_print_txstatus(txs);
1010 /* loop through all pkts and retry if not acked */
1012 tx_info = IEEE80211_SKB_CB(p);
1013 txh = (d11txh_t *) p->data;
1014 mcl = le16_to_cpu(txh->MacTxControlLow);
1015 plcp = (u8 *) (txh + 1);
1016 h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN);
1017 seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT;
1019 if (tot_mpdu == 0) {
1020 mcs = plcp[0] & MIMO_PLCP_MCS_MASK;
1021 mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel);
1024 index = TX_SEQ_TO_INDEX(seq);
1027 bindex = MODSUB_POW2(seq, start_seq, SEQNUM_MAX);
1028 BCMMSG(wlc->wiphy, "tid %d seq %d,"
1029 " start_seq %d, bindex %d set %d, index %d\n",
1030 tid, seq, start_seq, bindex,
1031 isset(bitmap, bindex), index);
1032 /* if acked then clear bit and free packet */
1033 if ((bindex < AMPDU_TX_BA_MAX_WSIZE)
1034 && isset(bitmap, bindex)) {
1035 ini->tx_in_transit--;
1036 ini->txretry[index] = 0;
1038 /* ampdu_ack_len: number of acked aggregated frames */
1039 /* ampdu_len: number of aggregated frames */
1040 rate_status(wlc, tx_info, txs, mcs);
1041 tx_info->flags |= IEEE80211_TX_STAT_ACK;
1042 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
1043 tx_info->status.ampdu_ack_len =
1044 tx_info->status.ampdu_len = 1;
1046 skb_pull(p, D11_PHY_HDR_LEN);
1047 skb_pull(p, D11_TXH_LEN);
1049 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw,
1055 /* either retransmit or send bar if ack not recd */
1057 struct ieee80211_tx_rate *txrate =
1058 tx_info->status.rates;
1059 if (retry && (txrate[0].count < (int)retry_limit)) {
1060 ini->txretry[index]++;
1061 ini->tx_in_transit--;
1062 /* Use high prededence for retransmit to give some punch */
1063 /* wlc_txq_enq(wlc, scb, p, WLC_PRIO_TO_PREC(tid)); */
1064 wlc_txq_enq(wlc, scb, p,
1065 WLC_PRIO_TO_HI_PREC(tid));
1068 ini->tx_in_transit--;
1069 ieee80211_tx_info_clear_status(tx_info);
1070 tx_info->status.ampdu_ack_len = 0;
1071 tx_info->status.ampdu_len = 1;
1073 IEEE80211_TX_STAT_AMPDU_NO_BACK;
1074 skb_pull(p, D11_PHY_HDR_LEN);
1075 skb_pull(p, D11_TXH_LEN);
1076 wiphy_err(wiphy, "%s: BA Timeout, seq %d, in_"
1077 "transit %d\n", SHORTNAME, seq,
1078 ini->tx_in_transit);
1079 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw,
1085 /* break out if last packet of ampdu */
1086 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) ==
1090 p = GETNEXTTXP(wlc, queue);
1094 /* update rate state */
1095 antselid = wlc_antsel_antsel2id(wlc->asi, mimoantsel);
1097 wlc_txfifo_complete(wlc, queue, ampdu->txpkt_weight);
1100 /* initialize the initiator code for tid */
1101 static scb_ampdu_tid_ini_t *wlc_ampdu_init_tid_ini(struct ampdu_info *ampdu,
1102 scb_ampdu_t *scb_ampdu,
1103 u8 tid, bool override)
1105 scb_ampdu_tid_ini_t *ini;
1107 /* check for per-tid control of ampdu */
1108 if (!ampdu->ini_enable[tid]) {
1109 wiphy_err(ampdu->wlc->wiphy, "%s: Rejecting tid %d\n",
1114 ini = SCB_AMPDU_INI(scb_ampdu, tid);
1116 ini->scb = scb_ampdu->scb;
1117 ini->magic = INI_MAGIC;
1121 static int wlc_ampdu_set(struct ampdu_info *ampdu, bool on)
1123 struct wlc_info *wlc = ampdu->wlc;
1125 wlc->pub->_ampdu = false;
1128 if (!N_ENAB(wlc->pub)) {
1129 wiphy_err(ampdu->wlc->wiphy, "wl%d: driver not "
1130 "nmode enabled\n", wlc->pub->unit);
1133 if (!wlc_ampdu_cap(ampdu)) {
1134 wiphy_err(ampdu->wlc->wiphy, "wl%d: device not "
1135 "ampdu capable\n", wlc->pub->unit);
1138 wlc->pub->_ampdu = on;
1144 static bool wlc_ampdu_cap(struct ampdu_info *ampdu)
1146 if (WLC_PHY_11N_CAP(ampdu->wlc->band))
1152 static void ampdu_update_max_txlen(struct ampdu_info *ampdu, u8 dur)
1156 for (mcs = 0; mcs < MCS_TABLE_SIZE; mcs++) {
1157 /* rate is in Kbps; dur is in msec ==> len = (rate * dur) / 8 */
1159 rate = MCS_RATE(mcs, false, false);
1160 ampdu->max_txlen[mcs][0][0] = (rate * dur) >> 3;
1161 /* 40 MHz, No SGI */
1162 rate = MCS_RATE(mcs, true, false);
1163 ampdu->max_txlen[mcs][1][0] = (rate * dur) >> 3;
1165 rate = MCS_RATE(mcs, false, true);
1166 ampdu->max_txlen[mcs][0][1] = (rate * dur) >> 3;
1168 rate = MCS_RATE(mcs, true, true);
1169 ampdu->max_txlen[mcs][1][1] = (rate * dur) >> 3;
1173 void wlc_ampdu_macaddr_upd(struct wlc_info *wlc)
1175 char template[T_RAM_ACCESS_SZ * 2];
1177 /* driver needs to write the ta in the template; ta is at offset 16 */
1178 memset(template, 0, sizeof(template));
1179 memcpy(template, wlc->pub->cur_etheraddr, ETH_ALEN);
1180 wlc_write_template_ram(wlc, (T_BA_TPL_BASE + 16), (T_RAM_ACCESS_SZ * 2),
1184 bool wlc_aggregatable(struct wlc_info *wlc, u8 tid)
1186 return wlc->ampdu->ini_enable[tid];
1189 void wlc_ampdu_shm_upd(struct ampdu_info *ampdu)
1191 struct wlc_info *wlc = ampdu->wlc;
1193 /* Extend ucode internal watchdog timer to match larger received frames */
1194 if ((ampdu->rx_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) ==
1195 IEEE80211_HT_MAX_AMPDU_64K) {
1196 wlc_write_shm(wlc, M_MIMO_MAXSYM, MIMO_MAXSYM_MAX);
1197 wlc_write_shm(wlc, M_WATCHDOG_8TU, WATCHDOG_8TU_MAX);
1199 wlc_write_shm(wlc, M_MIMO_MAXSYM, MIMO_MAXSYM_DEF);
1200 wlc_write_shm(wlc, M_WATCHDOG_8TU, WATCHDOG_8TU_DEF);
1205 * callback function that helps flushing ampdu packets from a priority queue
1207 static bool cb_del_ampdu_pkt(struct sk_buff *mpdu, void *arg_a)
1209 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(mpdu);
1210 struct cb_del_ampdu_pars *ampdu_pars =
1211 (struct cb_del_ampdu_pars *)arg_a;
1214 rc = tx_info->flags & IEEE80211_TX_CTL_AMPDU ? true : false;
1215 rc = rc && (tx_info->control.sta == NULL || ampdu_pars->sta == NULL ||
1216 tx_info->control.sta == ampdu_pars->sta);
1217 rc = rc && ((u8)(mpdu->priority) == ampdu_pars->tid);
1222 * callback function that helps invalidating ampdu packets in a DMA queue
1224 static void dma_cb_fn_ampdu(void *txi, void *arg_a)
1226 struct ieee80211_sta *sta = arg_a;
1227 struct ieee80211_tx_info *tx_info = (struct ieee80211_tx_info *)txi;
1229 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
1230 (tx_info->control.sta == sta || sta == NULL))
1231 tx_info->control.sta = NULL;
1235 * When a remote party is no longer available for ampdu communication, any
1236 * pending tx ampdu packets in the driver have to be flushed.
1238 void wlc_ampdu_flush(struct wlc_info *wlc,
1239 struct ieee80211_sta *sta, u16 tid)
1241 struct wlc_txq_info *qi = wlc->pkt_queue;
1242 struct pktq *pq = &qi->q;
1244 struct cb_del_ampdu_pars ampdu_pars;
1246 ampdu_pars.sta = sta;
1247 ampdu_pars.tid = tid;
1248 for (prec = 0; prec < pq->num_prec; prec++) {
1249 bcm_pktq_pflush(pq, prec, true, cb_del_ampdu_pkt,
1250 (void *)&du_pars);
1252 wlc_inval_dma_pkts(wlc->hw, sta, dma_cb_fn_ampdu);